In order to investgate occurrence species and the distribution characteristics of stored-grain insect in Inner mongolia autonomous region, 6 cities and 1 league were selected in total 69 sampling point, including 20 food processing factory, 20 grain depots and 29 farmers. The investigation result shows that there are 6 orders, 25 families, 49 species in this investigation, in which coleoptera is the most abundant species with 38 species in total. The main occurrence species are Sitophilus oryzae (Linnaeus), Sitophilus zeamais Motschulsky, Plodia interpunctella (Hübner), Cryptolestes ferrugineus (Stephens). The natural enemies of stored grain pests were few, and 4 species were investigated. What is more, one quarantine insect species: Callosobruchus maculatus (Fabricius) is found in some grain depot. The pest mainly occurred in factories, but the species are more abundant in gain depots. In the three types of sampling point, the main occurrence species are consistant.